High Step-Down Multiple-Output LED Driver with the Current Auto-Balance Characteristic

Quanming Luo; Binxin Zhu; Weiguo Lu; Luowei Zhou

High Step-Down Multiple-Output LED Driver with the Current Auto-Balance Characteristic

Vol. 12, No. 4, pp. 519-527, Jul. 2012

10.6113/JPE.2012.12.4.519

DF buck

One cycle controller

Small signal model

PDF

Abstract

A high step-down multiple-output LED driver is proposed in this paper. Firstly, the derivation of the driver with dual-output is presented and its operation principle and steady state performance are analyzed in detail. Secondly, a high step-down N-channel LED driver is proposed and its current auto-balance characteristic and step-down ratio are analyzed. Finally, an experimental prototype is built and the experimental results are given. The theoretical analysis and experimental results show that the proposed driver has the following virtues: First, if load balancing is achieved, the voltage gain is 1/N that of a Buck driver, where N is the number of channels. Second, each output automatically has an equal output current, without requiring more current close-loop control circuits than a Buck driver. Last, the voltage stresses of the switches and diodes are lower than those of a Buck driver, meaning that lower voltage switches and diodes can be used, and a higher efficiency can be expected.

Statistics

Show / Hide Statistics

Cumulative Counts from September 30th, 2019
Multiple requests among the same browser session are counted as one view. If you mouse over a chart, the values of data points will be shown.

Cite this article

[IEEE Style]

Q. Luo, B. Zhu, W. Lu, L. Zhou, "High Step-Down Multiple-Output LED Driver with the Current Auto-Balance Characteristic," Journal of Power Electronics, vol. 12, no. 4, pp. 519-527, 2012. DOI: 10.6113/JPE.2012.12.4.519.

[ACM Style]

Quanming Luo, Binxin Zhu, Weiguo Lu, and Luowei Zhou. 2012. High Step-Down Multiple-Output LED Driver with the Current Auto-Balance Characteristic. Journal of Power Electronics, 12, 4, (2012), 519-527. DOI: 10.6113/JPE.2012.12.4.519.